Disorient, also called stun, is a Status Effect. An enemy under the affects of a Disorienting power is unable to activate click or toggle powers, and can only move slowly by staggering. Disorienting also shuts off any running toggle powers. It has no effect on auto powers.
Although they're greatly slowed, players remain in control of which direction they move while disoriented. Critters, on the other hand, move in random directions.
Problems With Disorient
A critter that's Disoriented while moving from Point A to Point B will continue moving to B at its original direction and speed. Only then will it begin moving slowly and randomly. Furthermore, Disorienting apparently applies no penalties to flight speed, jump speed, or jump height, so enemies that have automatic, unsuppressible travel powers can move at unexpectedly high speeds.